59 lines
1.0 KiB
Go
59 lines
1.0 KiB
Go
package throttle
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import (
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"sync"
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"time"
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)
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// Throttle wraps a function so that internal function does not get called
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// more frequently than the specified duration.
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func Throttle(d time.Duration, f func()) func() {
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return throttle(d, f, true)
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}
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// After wraps a function so that internal function does not get called
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// more frequently than the specified duration. The delay is added after function
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// has been called.
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func After(d time.Duration, f func()) func() {
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return throttle(d, f, false)
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}
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func throttle(d time.Duration, f func(), wait bool) func() {
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var next, running bool
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var mu sync.Mutex
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return func() {
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mu.Lock()
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defer mu.Unlock()
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next = true
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if !running {
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running = true
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go func() {
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for {
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mu.Lock()
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if next == false {
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running = false
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mu.Unlock()
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return
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}
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if !wait {
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next = false
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}
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mu.Unlock()
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if wait {
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time.Sleep(d)
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mu.Lock()
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next = false
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mu.Unlock()
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f()
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} else {
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f()
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time.Sleep(d)
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}
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}
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}()
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}
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}
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}
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